an 
Anatomy of Cerithium Telescopium. 433 
Through the mantle are readily traced the rectum, matrix, sac of vis- 
cosity, stomach and liver. On opening this along the left side, the 
branchiz, rectum and matrix are seen in situ. 
The organ of respiration consists of a long single row of triangular 
plates, which are less and less elevated as they are more distant from the 
margin, and are at last little more than parallel wrinkles. The vessel 
which carries the arterial blood to the heart is distinctly traceable on the 
left side, running down to the heart which as usual lies close to the sac of 
viscosity; the auricle is small and curved; the ventricle much firmer 
and obovate. This gives off two large vessels and a smaller one, of 
which one supplies the liver, but before it reaches it gives off a large 
vessel above the rectum: the various ramifications in the liver are well 
marked; some of them are represented in fig. 3. The second vessel 
given off from the ventricle runs parallel with the heart and pulmonary 
artery to supply the anterior parts of the animal. The third passes 
immediately above a particular organ (m. fig. 5.) to be mentioned pre- 
sently. We were notable to trace returning vessels. 
The parts of the mouth are very small; the tongue very short, fur- 
nished as usual with regularly disposed reflexed teeth ; the salivary ducts” 
enter on each side above the point of insertion of the tongue, and after 
running down on either side of the esophagus, suddenly turn back ; and 
there the glands are seen curling from side to side, and at length united 
together just below the apex of the tongue. A single short flat ligament 
is attached to the mass of the mouth behind, and inserted into the foot 
beneath the cesophagus, 
The esophagus is very long, runs. backwards to the stomach in sathe 
direction of the volution, and enters into it laterally at the further end. 
The stomach is of a very curious and complicated srructure. It is 
divided by valvular processes into three portions, which are not however 
distinctly marked externally. » 
The first of these occupies rather more than the upper half of the 
whole stomach. It is into this, immediately above the constriction, that 
the esophagus enters obliquely between two plates. Of these the 
external one runs down to theapex of the stomach ; the inner runs only 
Vou, V, FF 
